t558: Fix root path in build script
t558: Fix root path in build script

njam/CM,tomaszdurka/CM,cargomedia/CM,christopheschwyzer/CM,fauvel/CM,zazabe/cm,mariansollmann/CM,njam/CM,cargomedia/CM,alexispeter/CM,tomaszdurka/CM,christopheschwyzer/CM,njam/CM,njam/CM,christopheschwyzer/CM,mariansollmann/CM,alexispeter/CM,alexispeter/CM,zazabe/cm,alexispeter/CM,fauvel/CM,zazabe/cm,fvovan/CM,njam/CM,vogdb/cm,zazabe/cm,mariansollmann/CM,fauvel/CM,fvovan/CM,vogdb/cm,vogdb/cm,cargomedia/CM,mariansollmann/CM,fauvel/CM,cargomedia/CM,fvovan/CM,tomaszdurka/CM,vogdb/cm,vogdb/cm,christopheschwyzer/CM,tomaszdurka/CM,fvovan/CM,fauvel/CM,tomaszdurka/CM